Re: [ros-kernel] CVS commit: ReactOS

[Hartmut B. <har...@te...>]

> -----Ursprungliche Nachricht-----
> Von:	David Welch [SMTP:we...@cw...]
> Gesendet am:	Mittwoch, 8. Mai 2002 09:57
> An:	rea...@li...
> Betreff:	Re: [ros-kernel] CVS commit: ReactOS
>
> On Wed, May 08, 2002 at 12:52:36AM +0200, Hartmut Birr wrote:
> > Fixed a bug in MmNotPresentFaultSectionView.
> >
> Could you explain the reason for this change.

If two processes have a not present fault within the same address range, 
there is called MmNotPresentFaultSectionView. The first get the pageop and 
handles the fault. The second use this page, if the event in the pageop is 
signaled. If the first process terminate before the second can map the 
page, than is the page unmapped and not longer valid. There occurs a bug 
check within the following call to MmReferencePage. If gcc uses piping, 
there are started three processes within a short time and two of them does 
also exit at the same time. The page fault occurs within msvcrt.dll when 
__atexit_ptr is accessed from exit. The faulting address is __atexit_ptr. 
The first fix was to init this variable within DllMain but the real problem 
is in MmNotPresentFaultSectionView.

- Hartmut